Rail pantograph



R. H. BENNETT'.

RAIL PANTOGRAPH.

APPLICATION FILED MAR. 2| 192,0.

1,418,614. PatenltedJune 6,1922.

nnssELL H. BENNETT, or, Tucson,Ani zf'iiliiifl f- RAL PANTOGRAPH.

'iaisgaiaV To all whom t may concern.'

Be it known that I, RUSSELL li.' Bnnin'r'r, a citizen of the United States, residing at l Tucson, county of Pima, and State ofA-'rizona, have invented a certain new and useful Rail Pantograph, of `which the following is a specification. .i

Thisinvention relatesto an instrument for making mechanically a drawing or dia gram of an object, and it has especiall refer.-

ence to a polar pantograph for recording' upon a fiat surface the rtrue and accurate profile, outline or contour particularly'jof! a 1ail,with` the end'in view of ascertaining from'such drawing the condition'of the rail and thereby determining its fitness for further use. f

One of themain objects of thisinvention is to provide a simple means for accomplish# ing this purpose, in which the delineationof the object may be recorded graphically .with ease and rapidity and which may be quickly attached to and removed from the object.

, Other objects will appear from the subjoined specification in connection with the accompanying drawing, showing .a preferred form of the invention, and in which-` Fig. l is a front view showing the invention as applied. f

F ig. 2 is a side View partly in section.l

rl`he invention, generically considered,

comprises a rail engaging member and an in- Strument associated therewith, comprisingv a tracer and a marker. y

Specifically the invention may comprise a clamp 1, consisting of two legs 2 and 8,

the lower ends of which are inwardly bent and constitute substantially/'a rail-web-engaging jaw, co-operating with two plates 6 and 7, respectively fastened at one side to j the front and back of said legs 2 and 3, and

l each plate 6 and 7 formed in its free end with 'a curving recess 8 and 9, .arranged for engagement with a pin 10 and 11, on the front and back, respectively, `of each leg, securely to conjoin the two legs and form a substantial support for the clamp when applied to a rail. plates 6 and 7, as seen, lie or resty upon the highest portion of the rail head regardless of its shape or condition of its wear and, co-

operating `with the jaw portion of the legs, .maintains the clamp in upright position or at an accurate right angle to the horizontal plane of the rail head.- These plates also Serve toy bring together the two legs when Specification of Letters Patent.`

The lower edges of thel applying-the clamp, theafywightflfheref 'l l i tentati Iiiife6;-1922.y v`'Application inea March 2, 1920.A serial No.esatti?"" V5 "if" causingf 'the plates to n move toward."each other, consequently drawing 'tcfigethe'rathe*V legs., lreparatory to their beingl'locked'in position, as explained hereinafter.`

12 and 18 on the back and front' ofthe Crum.

The legs2 `and 3 are connectedby spacers 14, controllableby a handlefl' for "operating*y f y y the*y legs about thel fulcrumsfwhen placing'the f .70

clamp yupon for' removing? the; same from' a a yoke or bracket 19,swi.veled on the end lof a slotted bar 20, that is movable relatively to l a central guide and pivot pin 21,`centrally provided in the spacers 12 yand 13. f The.

movement of thestylus 18 along the profile or outline of an object is recorded upon the 3 card 17 by means of a pencil. 22 yor other drawing or inseribing means,frmly'held in the end of a complementary slotted bar 2,3,` also movable relatively tothe central guide and pivot pin 21',the two bars 20 and 23 being interconnected and heldin perfect yalinelnent by anx eXpansible'means, as lazyy tongs 24, pivotally attached at-itsresp'ec# tive ends to saidfbarsz20and 23,;andren-@ffl trally supportedv upon. such pivot pin 21-l about which theentire tracing land marking frame may be swung and operated during the process' of making a diagram.

Assuming that the object selected bea.

raily 2.5, the stylus Y18 and pencilr 17j are grasped by thehands of the operator and the stylus moved about that portion ofthe rail desired to be outlined, while the recordation is made simultaneouslygupon the card 17; On account ofthe irregularity1 and Y changing planes ofl the object, the -stylus is adjustable to enable the point thereof to fol'- low closely all surfaces, and` hence, when" for instance the underand outside of the rail head have been traversed,'the stylus is turnedto bring the `apeX thereof upon the tread, and this is accomplished by manipulation of the knurled nut 26 vscrewed-or otheriio v wise lconnected withthe shank of the stylus.

Y MW When thei'ecord is made, the device may be quickly and readily removed by lifting up .handle is pressed until the connected toggles pass their central aXis, at which time the handle-l5, engaging the upper inner ends ofthe legs 2 and 3, maintains the legs in rigid'locked. position upon, the object.

What Iclaim, isil. In a device for making outlines of an object, a clamp comprising pivoted jaws adapted to" embrace said object, means securing .the upper endsot said jaws whereby lthe clamp may be lifted, said means expand'- ingsaid aws upon vlifting the clamp there! with and contracting Said jaws upon the arrestr of movement of' said clamp` bysaid object, means on one'ofsaid jaws 'for arresting movement of andy supporting the clamp Von engagement with said object, and, a tracing and marking ymechanism mounted on ksaid clamp.

2. In a device for making outlines of an object, a clamp comprising jaws connected to each' other by pivotal means intermediate n their ends, a handle toggle connecting corresponding ends of the jaws, means on one of said jaws for yarresting' lmovement of and supporting the clamp on engagement with said object, and a tracing and marking meclii anism mounted on said clamp.`

3. A device for making outlines of an ob-l ject comprising two members inwardly-bent at one end, platessecured -to said members and co-operating with saidf endsto `form a clamping jaw, means connectingv and lor pivoting said members, means to operate said members abouttlieir pivotsyand anexpansible frame pivotally mountedV on said connecting means, and provided at one end lwith a stylus and at .the other end with a 'marken' In testimony whereof l have setmyhand.

RUSSELL H. BENNETT. 

